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From: mahesh@cs.fau.edu (Mahesh Neelakanta)
Newsgroups: comp.sys.hp
Subject: Malloc Internal structure
Message-ID: <1990Nov13.051452.21908@cs.fau.edu>
Date: 13 Nov 90 05:14:52 GMT
Distribution: comp
Organization: Florida Atlantic University, Boca Raton
Lines: 29

Greetings again, I'm back with another question :-)

  I have X11R4 Compiled with gcc 1.37.1 and have it working nicely. The
only problem is that sometimes when I compile X apps from expo or somewhere
else, the executable exits saying realloc() could not find anymore memory.
So, I kinda wrote a realloc() that just malloc'd the memory needed and copied
the original contents over to the new memory. The problem is that I need
to know the size of the original memory. From what I've read (in K&R and
soem other books) malloc stores this info before the actual memory that
we use starts, i.e:

           ------------------------------
          |              |                .......
           ------------------------------
            ^^^^^^^^^^^^^  ^^^^^^^^^^^^^
            Memory info     User memory (what malloc() returns a ptr to)

Right? Well, what is the structure of the memory info block for hp-ux
7.0 (for s300's)?  I do not have source access so I am asking the net.
Please reply via E-Mail or posting(If you think others will benefit
form this). BTW anyone else had problems with malloc under hp-ux? I've
tried both versions of malloc (one in libc.a and the libmalloc.a) and
both give me problems. Thanks again all you folks in net-space.

Mahesh Neelakanta                               Internet: mahesh@cs.fau.edu
Undergrad Student (CS)                                    mahesh@acc.fau.edu
(407) 367-3981                                  Bitnet:   mahesh@fauvax

                  Danger Past, God Forgotten. - Tamil Proverb